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MATHS nerds look out, there's a puzzle that'll pique your interest doing the rounds.

And you'll either be left scratching your head - or figure it out real quick.

Can you figure the final sum out?
1
Can you figure the final sum out?Credit: @supereasymath

But can you solve it in 20 seconds?

That's the challenge set by TikToker who shared the brainteaser.

The video shows three sums, with a fourth left for you to figure out.

But don't be fooled by the addition symbols...

Read more puzzles

The first seems pretty innocent, with 2 + 4 = 6.

But the next goes off, with 3 +5 = 12.

The final clue is 4 + 6 = 20.

So what is 9 + 11?

If you're thinking 20, you're wrong.

Despite the trick in the first sum, it's not 2 plus 4, it's actually 2 multiplied by 4 minus 2... which also gives 6.

Read More on The Sun

And the same pattern is continued with the others.

This means 9 + 11 is... 90.

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